You can represent clients in other jurisdictions by associating yourself with local counsel in that jurisdiction. This practice is almost as common as breathing in the legal profession and there’s nothing unethical about it.
It is generally allowed if one appears in court and seeks permission to do so. As my comment stated, this is called making a “pro hac vice” appearance.
I find it curious that Allred frequently flies into a location outside of California and appears in front of a microphone and announces that she is representing someone. Of course, given her ego and the media’s lack of attention, no coverage is given to her local co-counsel, if any exists. Moreover, in numerous cases, no lawsuit actually results. It is all about Allred getting camera time or pushing her political agenda. She is a Democratic party activist after all.
Interestingly, the California State Bar is investigating Allred. We will have to wait and see if any discipline is imposed.